So you want to turn your existing desk into an electric standing desk? The Halter Electric Sit / Stand Desk has you covered. It fits most desks and can be controlled using simple buttons. The desk lets you switch from sitting to standing position in a few seconds. It measures 74.2″ long and 23.6″ wide. It weighs under 37 lbs and has a max load of 55 lbs.
To get started, simply put this on top of your table, and you are ready to go. Costs under $350 at this time.